Why isn't the Jin Dynasty listed in the high school history books?

The Jin Dynasty was not listed in the high school history books because it was a dynasty in Chinese history. Its appearance had an important impact on the development of Chinese history, but its existence was relatively short and its status in history was not very high. The Jin Dynasty was a dynasty in Chinese history from 265 to 420 A. D. It was the early stage of the Jin Dynasty during the Three Kingdoms period and the first dynasty during the Northern and Southern Dynasties. During the Jin Dynasty, the social economy developed rapidly, and culture and art flourished. Many excellent literary works appeared, such as the Book of Jin and the Book of Songs. However, due to the political system, cultural ideology and other aspects of the Jin Dynasty and the previous dynasty were more different, and its existence was relatively short, its status in history was not very high. In high school history textbooks, the Jin Dynasty was usually introduced as a dynasty during the Three Kingdoms period rather than a separate dynasty.